<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style type="text/css"></style>
		<script  type="text/javascript">
			
			//Number   整数  浮点数
			let  age = 50;
			
			let weight = 90.05;
					
			
			let name = 'jshand';
			let address = "黑龙江哈尔滨";
			
			let success = true;
			let fail = false;
			
			let varUndefined ;
			let varNull = null ;
			
			console.log("age",age);
			console.log("weight",weight);
			console.log("name",name);
			console.log("address",address);
			console.log("success",success);
			console.log("fail",fail);
			console.log("varUndefined",varUndefined);
			console.log("varNull",varNull);
			
			
			
		</script>
	</head>
	<body>
		
		
	</body>
</html>